Patent US4465228A successfully refreshed from Google Patents.
US4465228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooker with heating control system
Assignee: Panasonic Holdings Corp
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Filing: 1982-08-26
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Granted: 1984-08-14
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Expires: 2002-08-26
Abstract
Abstract A highly automationed cooking apparatus especially suitable for stew cooking or the like liable to boiling over. Temperature of outer bottom face of a pan is measured by a sensor and temperature gradients are sampling-measured at a sampling time pitch. Boiling point of food material is detected by finding a decrease of the temperature gradient, and thereafter the heating is lowered to avoid boiling over to a suitable value which is given by processing the temperature gradients.
Inventors
- 👤 Keiichi Mori
- 👤 Shojiro Inoue
- 👤 Manabu Takada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:54
CPC Classifications
A; A47; A47J; A47J27/00; A47J27/56; A47J27/62; G; G05; G05D; G05D23/00; G05D23/19; G05D23/1917; G05D23/20; G05D23/24
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
134 words
A cooker comprising: heating means for heating food material in a container, temperature measuring means for measuring temperature of outer face of the container, and issuing temperature signals, heat amount control means for controlling amount of heat issued from the heating means and a heat control circuit part for issuing a control signal to be given to the heat amount control means based on said temperature signals input thereto, said heat control circuit part comprising temperature gradient signal generator means for producing signal of temperature gradient from the input temperature signal, bending point detector means for detecting bending point of the temperature increase and issuing a detection signal and heat control signal generator for outputting the control signal for the heat amount control means basing at least on output of the bending point detector.
Claim 2
Dependent Claim
134 words
A cooker comprising: heating means for heating food material in a container, temperature measuring means for measuring temperature of outer face of the container, and issuing temperature signals, heat amount control means for controlling amount of heat issued from the heating means and a heat control circuit part for issuing a control signal to be given to the heat amount control means based on said temperature signals input thereto, said heat control circuit part comprising temperature gradient signal generator means for producing signal of temperature gradient from the input temperature signal, bending point detector means for detecting bending point of the temperature increase and issuing a detection signal and heat control signal generator for outputting the control signal for the heat amount control means basing at least on output of the bending point detector.
Claim 3
Dependent Claim
58 words
A cooker in accordance with claim 1, wherein said temperature gradient signal generator is constructed to sample said temperature signals with sampling time pitch to produce temperature differences between temperatures at neighboring sampling times, and said bending point detector is constructed to detect a time when ratio between neighboring ones of said temperature gradient exceeds a reference range.
Claim 4
Dependent Claim
58 words
A cooker in accordance with claim 1, wherein said temperature gradient signal generator is constructed to sample said temperature signals with sampling time pitch to produce temperature differences between temperatures at neighboring sampling times, and said bending point detector is constructed to detect a time when difference between neighboring ones of said temperature gradient exceeds a reference range.
Claim 5
Dependent Claim
52 words
A cooker in accordance with claim 1, wherein, in said heat control circuit, a measured temperature of said temperature measuring means at the time of bending point detection is set as a set temperature, and amount of heating thereafter is controlled responding to temperature differences between measured temperatures and said set temperature.
Claim 6
Dependent Claim
52 words
A cooker in accordance with claim 2, wherein, in said heat control circuit, a measured temperature of said temperature measuring means at the time of bending point detection is set as a set temperature, and amount of heating thereafter is controlled responding to temperature differences between measured temperatures and said set temperature.
Claim 7
Dependent Claim
58 words
A cooker in accordance with claim 3, wherein said temperature gradient signal generator is constructed to sample said temperature signals with sampling time pitch to produce temperature differences between temperatures at neighboring sampling times, and said bending point detector is constructed to detect a time when difference between neighboring ones of said temperature differences exceed a reference range.
Claim 8
Dependent Claim
26 words
A cooker in accordance with claim 4, wherein said heat control circuit controls amount of heating responding to said temperature gradient at an initial heating stage.
Claim 9
Dependent Claim
26 words
A cooker in accordance with claim 5, wherein said heat control circuit controls amount of heating responding to said temperature gradient at an initial heating stage.
Claim 10
Dependent Claim
26 words
A cooker in accordance with claim 6, wherein said heat control circuit controls amount of heating responding to said temperature gradient at an initial heating stage.
Claim 11
Dependent Claim
25 words
A cooker in accordance with claim 4, wherein said heat control circuit adjusts said set temperature responding to temperature gradient at an initial heating stage.
Claim 12
Dependent Claim
25 words
A cooker in accordance with claim 5, wherein said heat control circuit adjusts said set temperature responding to temperature gradient at an initial heating stage.
Claim 13
Dependent Claim
25 words
A cooker in accordance with claim 6, wherein said heat control circuit adjusts said set temperature responding to temperature gradient at an initial heating stage.
Claim 14
Dependent Claim
36 words
A cooker in accordance with claim 1, wherein said temperature gradient signal generator means issues said temperature gradient signal to said bending point detect means only after reaching of the measured temperature to a predetermined temperature.
Claim 15
Dependent Claim
28 words
A cooker in accordance with claim 1, wherein a reference value for use in deciding said bendingpoint is adjusted responding to temperature gradient at an initial heating stage.
Claim 16
Dependent Claim
28 words
A cooker in accordance with claim 2, wherein said reference value to be compared with said ratio is adjusted responding to temperature gradient at an initial heating stage.
Claim 17
Dependent Claim
28 words
A cooker in accordance with claim 3, wherein said reference value to be compared with said difference is adjusted responding to temperature gradient at an initial heating stage.
Claim 18
Dependent Claim
49 words
A cooker in accordance with claim 1, wherein a reference value used for deciding said bending point is adjusted by selected one of a predetermined number of functions each having said temperature gradient as variant, said selection being made responding to said temperature gradient at an initial heating stage.
Claim 19
Dependent Claim
46 words
A cooker in accordance with claim 16, wherein said bending point detection means decides bending point by comparison between a reference value and a temperature gradient which is obtained by sampling at a sampling time pitch, said sampling pitch being adjusted responding to said temperature gradient.
Claim 20
Dependent Claim
46 words
A cooker in accordance with claim 17, wherein said bending point detection means decide bending point by comparison between a reference value and a temperature gradient which is obtained by sampling at a sampling time pitch, said sampling pitch being adjusted responding to said temperature gradient.
Claim 21
Dependent Claim
38 words
A cooker in accordance with either one of claims 7, 8, 9, 10, 11, 12, 14, 15, 16 and 17, wherein said initial temperature gradient is a temperature gradient immediately after detection of a measurement of starting temperature.
Claim 22
Dependent Claim
24 words
A cooker in accordance with claim 1, wherein said temperature sensor measures a temperature of outer face at substantial bottom part of said container.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-08-14 | 1988-02-13 | 1988-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-14 | 1992-02-13 | 1992-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-14 | 1996-02-13 | 1996-08-14 | $7700.00 | Window Closed / Lapsed |